leitner



June 10 1924.

J. F. LEITNER ADDING MACHINE 'Filed Aug. 25

1923 2 Sheets-Sheet 1 INVENTOR ATTORNEY WITNESS:

`une 10 1924.

J. F. LEITNER ADDING MACHINE Filed Aug. 25 1923 2 Sheets-.Sheet 2INVENTOR m EY i ATTORNEY WITNESS:

Patented June 10, 1924.v

UNITED sTATEs PATENT oFFicE.

JOSEPH F. LEITNEB, lF ATLANTA, GEORGIA,

MACHINE GOMPAN'Y,4 0F CHARLOTTE, NORTH CAROLINA, A CORPORATION.

ADDING MACHINE Application mea August 25, 192s. serm m. 659,395.

tended for use by architects and others and by means of which variousdimensions may be added in a simple and accurate way by 15 mechanicalmeans instead of by mathematical computation.

An important and more s ecic 'object is the provision of a device o thischaracter including a plurality of rotatable disks each 20 of whichisvprovided .with a plurality of holes corresponding to `the numbersthereon and into` the proper ones oi which may be inserted a pencilpoint tor the purpose or' turning the disks to the desired extent de- 25pending upon and corresponding to the dimensions to be added.

VSmother object is the provision of a device of this character having anovel connection `between thesuccessive registering disksso that thesuccessive disks will be rotated one or more steps when the precedingdisk is turned one complete revolution.

Another object is the provision of a device of this character which isprovided with simple resetting means which will enable the'operator toreturn all the disks to initial or zero indicating position after acomputation or operation.

An additional object is the provision of a device of this characterwhich will be simple and inexpensive in manufacture, efficient andaccurate in use, durable in service and a general improvement in theart. g

With the above and other objects and advantages in view the inventionconsists in the details of construction to be hereinafter more 'fullydescribed and claimed and illustrated in the accompanying drawings, inwhich:

to plan view of the device showlh re 1 is a inalltbe parts in iritial orzero position, igure 2 is a plan view with the cover removed,

at Atlanta, in the county of Fulton F Figure 3 is a. section on the line3-3 of Figure 2,

.Figure 4 is a section on the line 4 -4 of igure 2,

igure- 5 is a detail 5-5 of Figure 2, y

Figure 6 is a fragmentary view showing a slight modification,

Figure 'i' is a fragmentary sectional view shrwing a modified form ofresetting means, an

Figure 8 is a plan view thereof.

section on the line ASSIGNOB TO PBEGISION ADDING Referring moreparticularly to the drawings I have shown my device as comprising enelongated preferably rectangular casing 1d which may be provided withrubber or other bearingfeet 11. and which is also provided with a coverplate 12 secured in position by means or screws 13 or the like. Thesize, shape and materials may of course very depending upon therequirements of the manufacturer. -`Rising from the bottoni l of thecasing are stubs'or spindles le, 15, 16, i? which pass through suitablebosses 18 on vthe bottom and rotatably mounted upon these spindles aredisks 18. 19. 20 and 21 respectiveiy and each of which carries a knob22. Screwed into the upper ends of the spindles are screws 23 whichoperate to prevent the disks and knobs from upward displacement. Theknobs are formed with depending reduced extensions '24 which arethreaded at their lower ends as shown. Each disk carries a stop pin 25for a purpose to be described. 4

The disk 18 is provided with indicia designating fractions of an inch,these indicia being arranged in circular series as shown adjacentcircular holes or recesses 26 and the periphery of the disk is termedwith ratchet teeth 27 corresponding in number to the number ofholes 26and having co-operating therewith a spring detent 28' which operates toprevent retrograde movement of the disk. The disk i9 beers a. series ofnumbers' rangin 'from 0 to 59 arranged in circular series an adjacentholes or recesses 29, the' numbers representing inches. The periphery ofthis disk is formed with teeth wlth winch cooperates a detent spring 31.The disk 20 bears a circular series o numbers ranging from 0 to 99 andlocated adjacent holes or recesses 32. The numeral 33 designates aspring retainer which `engages teeth 84 on the periphery of the disk forpreventinginovement in one direction. The numbers on this disk representfeet. The disk 21 is similarly provided with a series of numbers rangingfrom 0 to 59 designating hundreds of feet and located adjacent holes orrecesses 85. This disk is similar to theothers inasmuch as its peripheryis formed with teeth 36 eiigaged by a spring pawl 37 preventingnio-fement in one direction. It. is to be observed that the teeth onevery disk correspond to the number of holes therein. All the springdetents'28, 31, 38 and .37 are identica-lin construction and eachincludes a plate 8l pivoted upon the back of the casing at 82 and heldin adjusted position by a screw 83 which passes through a slot 84 in theplate 81 and into the casing. `The detent proper is formed on one end ofa small plate 85 pivoted at 86 and provided with an extension 87 towhich is connected one end of a spring 88 which has its other endsecured to the plate 81. Y

The transfer means between the different disks is as follows: Thereduced extension of the knob on the disk 18 carries a cain 38 having asingle projection 39 which co-operates with the free end of a lever 40which is rotatable on the spindle 15 and which carries a spring pressedpawl 41 engaging the teeth 30 of the disk 19. Secured on the extensionof the knob of the disk 19 is a cam 42 having five points 43 whichco-operate with the free end of a lever 44 pivoted on the spindle 16 andcarrying a spring pressed pawl 45 engaging .the teeth 34 of the disk 20.The reason for'having live points on the cam 42 is that the disk 19carries sixty graduations indicating inches and it -is thereforenecessary that one rotation of this disk 19 should cause the 'disk 2Oldesignating feet to be moved ve steps. The reduced extension of theknob on the disk 20 carries a cani 46 having a single point 47engageable with the free end of a lever 48 pivoted on the spindle 17 andcarrying a spring pressed pawl 49 'engaging the teeth 36 of the disk 21.By this construction itwill be seen that when the'disk 18 is turned oncethe lever 40 will swing so that the, pawl 41 will move the disk 19 onestep, one rotation of the disk 19 will operate the lever 44 ve times andconsequently move the disk 20 five steps, and

each rotation of the disk 20 will cause the lever 48 to move the disk 21one step. Obvlously it is necessary that there be one hundredgraduations on the disk 20., vAll the levers are urged in one directionby springs 40%. l

U Allthe pawls 41, 45 and 49 are identical in construction and eachincludes a plate 89 on one. end of which the pawl is formed, and thisplate is pivoted at 90 on the lever 40, 44 or 48, as the case may be.One end of the plate 90 is formed with a lug or extension 91 with whichis connected one end of a spring 92 which has its other end secured onthe lever. I

The cover 12 is formed above the respective disks with circular openings50, 51, 52 and 53 respectively at various points along which are notchesor cut away places 54, 55, 56 and 57 respectively which will expose onenumber on the disk beneath. Surrounding each of the openings in the topis a circular series of numbers corresponding to the indications on thedisks beneath and at the tops of these series ai'e the legendsFractions, Inches, Feet and Hundreds. Projecting inwardly from the edgesof the openings 50 to 53 are projections 58, 59. 60 and 61 ref.

spectivelywhich cross the series of holes in the respective disks andwhich are for a purpose to be described.

It is found necessary to extend ai'in 40" to provide a toothed portionadapted to co-operate with an escapement dog 40c to retard .the rapidmotion parts 40, 44, l48 when in:

uenced by the springs 40a.

The operation is as follows In adding together a series of dimensions orthe like, the operator takes the point of a pencil and inserts it withinthe hole 26 opposite the desired fractional designation on the coveraround the opening 50 and then turns the disk in a clockwise directionuntil the pencil point strikes the projection 58. This fractionalindication will then be shown at the opening 54. The successive'fractions to be added-are all treated in the saine way and if the sumis less than one whole inch the total amount will be shown at theopening 54. If the amount is greater than one inch ity is apparent. thatthe disk 18 will be rotated one coinplete revolution and somewhat moreand this will resultJ in turning the cam 38 which will trip the lever 44and causethe pawl 41 to move the disk 19 one step. The addition of theinches in the different dimensions is accomplished in the same manner onthe disk 19 by inserting the pencil point in the hole 29 opposite thedesired graduations around the opening 51 and turning the disk in aclockwise direction until the pencil point strikes the. projection 59.This is done with each of the inch dimensions and the total will beindicated at the opening 55. lf the disk 19 is rotated one-fifth ofarevolution indicating one foot, or rather twelve inches, the cam 42will trip the lever 44 once so that the pawl 45 thereon will move thedisk 20 one step. Amounts over and above groups of 12 will be disclosedat the o ening 55. The feet in the dimensions are a ded in the same wayby engagin the proper hole 32 and turning the disk 2Q in a similarmanner and the same operation the pencil point in' llO is true in addingthe hundreds on the disk 21. In this way it will be seen that theamounts are automatically transferred from each disk to the successiveone so that the addition is entirely automatic and being mechanical isbound to be accurate.

,After each adding operation it is of course necessary that the mal orinitial osition. To accom lish this I rovide an e on ated bar 62 whic isslidab e longitudinal y within the casing 10 Within Asuitablel guidesand which is ur ed in one direction by a spring 63. his

bar carries a knob 64 having its shank4 operating through a slot 65 inthe cover. Opposite the respective disksarestop strips 66 carrying lugs67 riding within inclined slots 68 in the bai-.62 so that when the baris moved longitudinally by means of the knob 64 these slots will exert acam action on the strips or plates 66 and force them all simultaneouslyinto the path of travel of the stop pins 25 on the various disks. Theknobs 22 of the disks are then manually turned until the pins 25 engagethe plates or strips 66 and the disks or dials will thus be reset atzero indicating osition.

In Figure 6 I ave shown a slight modification of tooth construction forYthe disks. In this figure the numeral 68 designates a ent of a diskhaving teeth 69 on the periphery thereof co-'operatin with a springelement 70. The essential eature is that the teeth are of such formationas to define a pocket 71 between the successive teeth,l this pocketreceiving the end of the spring and positively preventing any casualrotation of the disk.

In Figures 7 and 8 I have shown a modi` lied forni of means forresetting the mechanism. In these ures the numeral 72ldesignates a rotarisk corresponding to any one of the dis s 18, 19, 20 or 21 and carryinga stop pin 73. Slidable transversely of the casing,` at the disk is aplate'member 7 4 having an operating knob or handle 75 passing throughthe cover and slidable along a slot 76 therein, the sliding movementbeing facilitated by means of guides 77 extending longitudinal y of thecasing and passing through an elongated slot 78 in the member 74. rihisplatemember 74 is urged in one direction by a spring 79 and carries aprojection 80 which is normali held .by the spring out ot the path of te stop pin 73 when the disk is turned. By moving the parts be restoredto nor# yknob 75 to the other endof the slot 76 the From the foregoingdescription and a\ study of the drawingsv it will be a parent that. Ihave thus provided a Simp constructed and very easily operated addingdevice which will be highly advantageous for use by architects,engineers, builders and in fact all others having occasion to addtogether dimensions or other numerical data. It is of course conceivablethat it is possible to make such variations in the details ofconstruction and arrangement as will add greatly to the adaptability andutility of the device, as for instance the dials and vraduations thereofmay be such as to con orm to the metric system. In fact I reserve theright to make all such changes in the form, construction vandarrangement of parts as will not depart from the spirit of the inventionor the scope of the subjoined claim.

It will also be manifest from the foregoing that my novel device ispeculiarly adapted for the addition of English money, pounds and ouncesof avoirdu ois, troy7 or apotheearies weight, and in act commonfractions of all kinds.

Having thus described my invention I claim: v

An adding machine comprising adjoining related discs having toothededges and means whereby the discs ma be rotated, saidV discs also havingdesignations about the edges thereof, a casing enclosing said discs andhaving openings to expose all but the designation portions of the discs,said casing having cooperating designations about the edges of theopenings and slotted portions for revealin the desi ations on thediscs,'cams rotata le with-t e discs, levers bearing against said camsand moved thereby, resilient means to hold the levers in an initialposition, pawls carried by the levers for engaging the teeth on theedges of the discs whereby to transfer movement from one disc to anotheron shifting of the levers, racks movable with the levers, and pawlscooperating with the racks to check )the rapid movement of the levers bythe resilient means.

In testimony whereof I aiix mu signature.

JGSEPH F. L ITNER.

